Engine overspeed control

Details Engine overspeed control Engine overspeed control

1990-01-03

1990-10-23

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Engine speed reduction by partial or complete omission of...

123198DC, F02P 1102

Patent

active

049643851

ABSTRACT:
In a multicylinder internal combustion engine, an overspeed control circuit progressively cuts out ignition to the cylinders depending upon the amount the threshold is exceeded. A monostable multivibrator is set by the ignition pulse of a given cylinder to initiate a given timing interval of fixed duration. A charging capacitor circuit has a first capacitor charged by the output of the monostable multivibrator during the timing interval, and discharged during a second timing interval until the next ignition pulse of the given cylinder. A latching comparator is set by the ignition pulse of the given cylinder and disables a cut-out switch which in turn permits ignition pulses to the cylinders. A second capacitor is also charged during the first timing interval until it reaches a given threshold voltage, corresponding to a given engine threshold speed, and which resets the latching comparator, which in turn actuates the cut-out switch to cut out ignition pulses to the remaining cylinders. As engine speed increases, the ignition pulses of the given cylinder become closer in time, and the second timing interval becomes a lesser fraction of the time between ignition pulses of the given cylinder, such that the discharge time of the first capacitor becomes shorter, and the voltage on the first and second capacitors begins to increase along a positive slope ramp from a higher minimum, such that the voltage on the second capacitor reaches the threshold voltage at an earlier time following the ignition pulse of the given cylinder.

REFERENCES:
patent: 3738340 (1973-06-01), Olson
patent: 4015564 (1977-04-01), Fitzner
patent: 4252095 (1981-02-01), Jaulmes
patent: 4462356 (1984-07-01), Hirt
patent: 4594978 (1986-06-01), Kanno
patent: 4625689 (1986-12-01), Komurasaki
patent: 4776311 (1988-10-01), Venieres et al.
patent: 4919091 (1990-04-01), Wissmann et al.

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